Patent Application
20120267904
A grapple style compression latch is provided for use on off-highway vehicles and equipment, on-highway vehicles, stationary equipment, and other applications to retain a compartment door or access panel door in a closed position under heavy or high vibration loads.
Compartment and access panel doors on vehicles and other equipment normally include a latch to retain the door in a closed position. There are many different types of latches, depending on the particular use or application. For example, there are rotor-style latches, slam action latches, compression latches, as well as others. The environment where the vehicle or equipment is used often dictates the best type of latch for the compartment door. For example, vehicles and equipment used off road are often subjected to heavy loads and excessive vibrations or shocks, which may result in accidental opening of the door and premature failure due to excessive wear. Other types of compartments require compression seals, such as for sound mitigation. Also, pressure seals are often used on compartment doors, such as on RV's, marine applications, and military vehicles with explosion-proof compartments.
Therefore, a primary objective of the present invention is the provision of an improved door latch for use in applications having heavy vibration or shock loads.
Another objective of the present invention is the provision of a grapple style door latch with opposing jaws to capture a pin style striker on a vehicle or equipment door frame.
Another objective of the present invention is the provision of a grapple latch which eliminates or minimizes accidental opening of a compartment door.
Still another objective of the present invention is the provision of a grapple compression latch which captivates the striker in three axes.
Another objective of the present invention is the provision of a compression grapple latch which captures the striker to restrict vibration loading.
A further objective of the present invention is the provision of a grapple latch having an intuitive operation.
Yet another objective of the present invention is the provision of a grapple style compression latch for a vehicle or compartment door which is actuated without turning the door handle.
Another objective of the present invention is the provision of a grapple style latch for use with folding exterior door handle having a low profile.
A further objective of the present invention is the provision of a grapple style compression latch having a long useful life under extreme use conditions.
Yet another objective of the present invention is the provision of a grapple style latch which is more robust and secure than other types of latches.
Still another objective of the present invention is the provision of a grapple style latch which is durable and safe in use, and easy to operate.
These and other objectives have become apparent from the following description of the invention.
The grapple style compression latch of the present invention includes a housing having opposite front and rear, or exterior and interior sides. A handle is pivotally mounted on the exterior side to operate opposing grapple jaws on the interior side of the housing. The jaws move between open and closed positions to capture and release a pin style striker on a vehicle door frame. The jaws are mounted on a bracket on the inside of the housing and are connected to the handle by a pair of drive links. The jaws include cam slots which interface with jaw pins which drive the jaws between the open and closed positions for engaging and disengaging the striker. A compression spring on the interior side of the housing provides a load or force for an over-center action of the handle. The opposing grapple jaws provide a secure retention of the striker pin, even in situations of severe vibration and/or high loads, such as those that arise in off-road vehicle usage. The housing also includes a secondary spring clip to temporarily retain the door in a partially closed position so as to minimize door bounce back after the door is pushed or slammed toward the closed or shut position, until the handle is fully depressed to the closed or latched position to fully latch the striker.
The grapple style compression latch of the present invention is generally designation in the drawings by the reference numeral 10. The latch 10 is intended for use on vehicle doors, and particularly, vehicles which are subjected to severe vibrations and high loads, such as off-road vehicles.
The latch 10 includes a housing 12 having a front or exterior side 14 and a rear or interior side 16. The housing 12 includes an outer perimeter flange 18 surrounding a wall or recess 20. Preferably, the housing 12 is formed from one piece of stamped sheet metal.
A handle 22 is pivotally mounted and aligned in the well 20 on the front 14 of the housing 12. A pair of opposing jaws 24, 26, are pivotally mounted on the back side of the well 20 on the rear 16 of the housing 12. The handle 22 is pivotal between a closed position (shown in
An outside bracket 28 and an inside bracket 30 are fixed to the outside and inside of the well 20 on the front 14 and rear 16 of the housing 12, respectively, with fasteners, such as rivets 32. The outside bracket 28 includes an upstanding ear 34 with a hole 35 which aligns with a hole 36 in the handle 22 for receiving a padlock (not shown), so as to lock the handle 22 in the closed position, if desired, for additional security.
A pair of links 38 extend through aligned slots 40, 42, 44, and 46 in the outside bracket 28, the housing well 20, the inside bracket 30, and an inside plate 48, respectively. The outer ends of the links 38 have holes 50, while the inner ends of the links 38 have holes 52. The outer ends of the links 38 reside between opposing legs of a u-shaped yoke 54, which in turn resides between spaced apart legs 62 on the outside bracket 28, which in turn reside between opposite side legs 56 of the handle 22. A pin 58 extends through aligned holes in the handle legs 56 and yoke legs 54 and through the outer holes 50 of the links 38 so as to interconnect the links 38, the yoke 54, and the handle 22. The pin 58 is also cradled in notches 60 formed in the upstanding legs 62 of the outside bracket 28, so as to center the handle and maintain alignment of the handle 22 in the well of the housing 12. The pin 58 does not extend through the walls of the well 20 of the housing 12.
A drive pin 64 extends through the holes 52 on the inner ends of the links 38. The jaws 24 and 26 are also pivotally mounted on the pin 64, which extends through holes 65 on the jaws 24 and a hole 67 on the jaw 26. The jaw 26 resides between the links 38. The links 38 reside between the jaws 24, which in turn reside between a pair of spaced apart upstanding legs 70 on the bracket 30.
A pair of spacers 68 are mounted on opposite sides of the jaws 24 by a second pin 72. A third pin 80 extends through aligned holes in the legs 70 and through aligned slots 74 in the jaws 24 and slots 76 in the spacers 68. A fourth pin 82 extends through a slot 86 in the third jaw 26. The pins 80, 82 are retained by clips 78.
A compression spring 88 is mounted between the inside bracket 30 and the plate 48. When the handle 22 is in the closed position, the spring 88 is compressed between the inside bracket 30 and the plate 48. When the handle 22 is moved to the open position, spring 88 forces the plate 48 and the links 38 rearwardly, which in turn pushes the lower ends of the jaws 24, 26 inwardly or rearwardly by the interconnecting pin 64. The movements of the links 38 cause the jaws 24, 26 to open due to the arrangement of the slots 74, 86 on the fixed guide pins 80, 82. The spring 88 provides over-center action to the handle 22 in both the open and closed positions. When the handle 22 is in the open position, this over-center function of the spring notifies an operator that the door is not latched and fully secured. The over-centering function of the handle 22 is achieved due to the geometry of legs of the yoke 54. The pin 58 interacting with the notches 60 also keeps the handle 22 centered, and assures proper over-centering of the handle 22.
Conversely, when the handle 22 is moved from the open position to the closed position, the links 38 are pulled forwardly so as to compress the spring 88 between the inside bracket 30 and the plate 48, while the lower ends of the jaws 24, 26 are pulled outwardly or forwardly by the pin 64 so as to close the jaws 24, 26 as the slots 72, 86 allow the jaws 24, 26 to pivot about the fixed guide pins 80, 82. As best seen in
A guide plate 90 is mounted on the ends of the pins 80, 82 adjacent one side of the inside bracket 30. The plate 90 has a V or U-shaped notch 92. A spring clip 94 is mounted to the guide plate 90 via a rivet 96. The plate 90 and notch 92 help guide the door into alignment with a striker bolt or pin 11 (
Thus, the slots 74, 86 function as cam followers with the jaw pins 80, 82 as the drive links 38 and drive pin 64 moves the jaws 24, 26 between the open and closed positions. The compression spring 88 provides the load in the over-center action of the jaws 24, 26, and also drives the cam profile of the jaws 24, 26 on the cam pins 80, 82 so as to push the jaws open as the handle 22 is opened. The cam slots 74, 86 act as guides to move the jaws 24, 26 open a limited amount, and also act to close and retain the jaws 24, 26 on the striker, when the handle 22 is closed. The jaws 24, 26 of the compression latch 10 capture the striker pin on opposite sides, so as to secure the door, even in the event of violent racking.
The latch 10 may include an optional key lock mechanism 98, which is shown in all of the Figures, except for the exploded view of
It is understood that the grapple latch 10 of the present invention can be used on any door, such as a door or access panel door or a compartment. The opposing grapple jaws 24, 26 provide a secure retention of the striker, and survive severe vibration and high loads that often accompany vehicles or equipment in off-road usage.
It is also noted that the handle 22 has a longer lever arm as compared to the jaws 24, 26, to give the user a mechanical advantage when moving the handle 22 from the open position to the closed position and pulling a high strike load into place in the jaws.
The invention has been shown and described above with the preferred embodiments, and it is understood that many modifications, substitutions, and additions may be made which are within the intended spirit and scope of the invention. From the foregoing, it can be seen that the present invention accomplishes at least all of its stated objectives.
